Wearing hearing protection when shooting is critical. Bisley’s Active Electronic Hearing Protection gives you the ability to adjust and control noise reduction to a suitable level. These ear muffs have been specifically designed to fit comfortably around your ear, even during prolonged use. 2 AAA batteries power the ear defenders and then independent volume controls allow you to adjust the hearing level. Independent volume controls Uses 2 x AAA batteries (included) SNR 24dB Can be used with behind-the-ear style digital hearing aids Size: One Size